One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,3,4)(5,6)(7,11)(8,9)(10,12)(13,14,16,18)(15,19,20,17)(21,22,26,28)(23,24,25,27)(5,7)(6,10)(8,11)(9,12)(13,14,16,18)(15,17,20,19)(21,23,26,25)(22,27,28,24)(7,12)(10,11)(13,14)(15,17)(16,18)(19,20)(21,24,26,27)(22,23,28,25)(1,2)(3,4)(5,8,9,6)(7,10,12,11)(13,14)(15,17)(16,18)(19,20)(5,7)(6,11)(8,10)(9,12)(13,15)(14,17)(16,20)(18,19)(21,25,26,23)(22,24,28,27)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.